JP2008504962A - Pipe expansion equipment - Google Patents

Abstract

An object of the present invention is to provide a pipe expanding apparatus that is simple and easy and economical because a plurality of protrusions can be formed on one pipe.
The present invention relates to a pipe expanding apparatus, and more particularly, when expanding a small-diameter pipe having a small thickness, the idea is changed, and the elastic force and compression and bending characteristics of a spring are changed. However, a high elastic material steel wire machined into diagonal lines with an angle where the opposing contact cross-sections mesh with each other so that the contact length at both ends is extended is bent and wound, and a part of the body is cut A ring-shaped single-circular annular spring is formed, and when the annular spring formed in this way is used as a mold and is pressed, the elastic action of the spring causes a normal circumferential diameter to be increased. In addition, the structure of the mechanism is simple and economical with respect to the pipe expansion device that can expand the outer diameter of the pipe of the molding by the length of the circumference that is expanded by extending both ends. Easy to be unskilled Even it can be carried out easily.
[Selection] Figure 1

Description

  The present invention relates to a pipe expansion device, and more particularly, when expanding a thin pipe having a small thickness, the idea is changed and the elastic force and compression and bending characteristics of a spring are used. A ring in which a body part is cut by bending and winding a high-elasticity steel wire processed into a diagonal line with an angle where the contact cross sections facing each other are in parallel with each other so that the contact length of both ends is extended. ring), a circular spring having a single circumference is formed. When the annular spring formed in this way is used as a mold and is pressed, both ends of the annular diameter are more than the normal circumferential diameter due to the elastic action of the spring. Regarding the pipe expansion device that expands the outer diameter of the pipe of the molding by the expanded circumferential length, the structure of the mechanism is simple and economical, and the process is simple. Easy to carry out even for an expert Rukoto can.

  Usually, a pipe expansion device is used for expanding pipe tips to a desired shape when connecting pipes, connecting pipes of different sizes, or connecting assembly members separately. Device.

  In such a pipe expansion device, as a method for expanding a particularly thin and light small-diameter pipe made of a metal material such as a quick exhaust pipe or a smoke tube for a conventional combustor, the pipe is cut into two equal parts. Then, after forming the expanded portion of each separated pipe by a method such as press bending or bulging, and further joining by a method such as welding or soldering, or a pipe There is a method in which one side is cut open in the longitudinal direction and expanded, and then a tube expansion part is formed on one side and joined again by argon welding or soldering. However, the quality is deteriorated, for example, there is a variation in the expanded pipe portion thus derived, and the argon welding or soldering part is exposed to the outside as it is, the appearance is poor, and the workability is lowered. Furthermore, the man-hours for troublesome and complicated individual processes such as forming the expanded portion and separating and joining the pipes increase, resulting in a problem that productivity is reduced and costs are increased.

  Moreover, in the conventional pipe expansion method, the pipe expansion part which protrudes by the method of pressurizing using the mold produced separately and the circumference is expanded is formed, and the mold must be produced separately. It is uneconomical because it is bothersome and expensive, and costs increase. In addition, despite the necessity of performing pipe expansion work in accordance with work conditions and applications, the pipes can be expanded or expanded industrially in the case of partial pipe expansion, pipe expansion work for industrial large pipes, etc. The same pipe expansion method as used for large-diameter pipe work such as heavy equipment is used, which is inefficient.

  Therefore, the present invention has been made in view of the above-described conventional problems, and in particular, when expanding a small-diameter pipe having a small thickness, the elastic force of the spring during molding, and compression and bending during processing. Using the characteristics, a high elastic material steel wire machined into slanted lines with an angle where the opposing contact sections extend in parallel with each other so as to extend the contact length at both ends is bent and wound, and part of the body is wound A ring-shaped single-circular annular spring having a cut ring shape is formed. In this way, the end portion is a slanted oblique structure, and both end portions are expanded by compression and bending. Using a spring as a mold, the outer diameter of the pipe of the molding is expanded by the amount of the circumferential length that is extended by the elastic action of the spring when the pressure is applied. Can also be long pipes Part can be expanded pipe can form a plurality of 突爪 body in one pipe, simple and easy to provide a pipe expanding device for economical pipe.

  The configuration of the present invention made to achieve the above object will be described in detail with reference to the accompanying drawings. Here, detailed descriptions of well-known functions and configurations that may disrupt the gist of the invention are omitted.

  The present invention relates to a tube expansion device that expands a pipe by causing an operation rod to move freely by a piston advancing and retreating operation using a cylinder, and partially expanding and pressing the inner peripheral surface of the pipe to a tube expansion port connected thereto. 11 is connected to a fixed base 13 with a screw 12 and fastened, and a piston 16 and an operating rod 21 are connected and fixed to each other with screws 17a and 17b, and the operating rod 21 is moved forward and backward by driving the cylinder 10. A circular support frame 14 having a movable plate 15 to be moved; a hollow support pipe 22 in which an elongated round bar-like actuating bar 21 having a circular cross section is received concentrically on one side of the circular support frame 14; One side end portion 23b having a step jaw formed with the center axis 21 as a central axis is strongly coupled to one end portion of the support pipe by special welding, and only a part of the moving member 25 is inclined A part of the vertical inner end 23a at the other end is tapered and joined to the outer periphery of the actuating rod 21 so that the annular spring 24 is pushed up by the applied pressure, and the contact length of both ends A part of the body is separated and formed by bending and winding a high elastic material steel wire processed so as to mesh in parallel with each other so that the contact portions 24a and 24b that mesh with each other so as to extend are inclined. A ring-shaped single-circular annular spring 24 and a contact end portion 25a on one side coinciding with the fixing member 23 are tapered in cross section, and the other end portion operates on a cutting groove 25b that accommodates a screw 26 and an inner periphery. When the tube expansion port 20 is formed by the moving member 25 in which the screw portion 21b is formed so as to be engaged with the rod 21, the annular spring 24 is used as a molding die, and the operating rod 21 is pulled by driving the cylinder 10. Sometimes when the moving member 25 is slidingly moved together on the fixed member side and pressurizing the pipe 30 to be expanded fixed to the concentric axis, the spring is elastically actuated so that the thickness of the spring further increases than the normal circumferential diameter. The pipe having a configuration that expands and the outer diameter of the pipe to be expanded 30 is locally expanded by the length of the extended circumference and the thickness of a part of the spring (mold). It is a pipe expansion device.

  That is, in the present invention, when the moving member 25 slides and presses the fixed member 23 having a shape in which a part of the inner end portion 23a at one end is tapered and has a vertical surface and an inner inclined surface at the same time, The ring spring 24 is pushed up by the pressure applied by the collision of the inclined surface, and the entire length of the circumference and the thickness of a part of the spring (mold) are pushed out while pushing out the entire spring. Accordingly, the outer diameter of the pipe to be expanded 30 is locally expanded, and a minute gap is formed in the oblique contact portions 24a and 24b of the annular spring 24 facing each other and facing the diagonal direction. To occur. In the drawings, reference numerals 12, 17a and 17b denote screws, and reference numeral 18 denotes a support base.

  The present invention is a tube expansion forming port, and when the moving member is moved to the fixed member side to pressurize the pipe to be expanded, it is opposed so that the contact length of both ends is extended by the interposed molding die. An elastic steel wire processed into diagonal lines where the end faces of the contact part intersect each other is formed into a ring-shaped single-circular annular spring from which a part of the body is separated. Utilizing the circumferential length extending from the circumferential length of the tapered contact end and the thickness of the spring mold, as well as compression and bending during molding, it has a simpler structure and easily The pipe can be expanded, and after the expansion of the annular spring, it can be restored to its original circumferential length (pie) by the elastic restoring force of the spring. Excellent in thin Is its features to provide a pipe expanding device for a small-diameter pipe.

  Next, preferred embodiments of the present invention will be described with reference to the drawings.

  As shown in the figure, the present invention uses a cylinder 10 connected by a known hydraulic hose (not shown) or the like as an electric power source, and the cylinder 10 is placed on a support base 18 and a cylinder substrate. 11 is horizontally fixed to a plate-shaped fixing base 13 with a plurality of fastening screws 12 in a sandwich shape.

  A piston 16 is connected to one side of the cylinder 10 through a movable plate 15 inside a circular support frame 14 having a space formed therein, and a round bar-shaped operating bar 21 is provided on the other side. The screws 17a and 17b are connected and fixed as fastening means with a gap therebetween, and when the cylinder 10 is electrically driven, the piston 16 floats, whereby the movable plate 15 connected thereto is operated. Then, the actuating rod 21 is linked and moved.

  The operating rod 21 as described above accommodates the support pipe 22 fixed to one side of the circular support frame 14 on the outer peripheral surface on the same axis, and at the same time overlaps the pipes 30 to be expanded as will be described later. In order to receive power transmission, it is formed by passing through a circular support frame and extending inward, and screw portions 21a and 16a as fastening means are provided at one end of the extension portion. It is formed and fastened and fixed firmly to the movable plate 15 by screwing.

  In the tube expansion process, the other end of the actuating rod 21 coupled to the moving member 25 is also formed with a threaded portion 21b, and the moving member 25 is screw-fastened. The member 25 is configured to pressurize the annular spring 24 while the operating rod 21 is pulled by the operation of the cylinder 10 and is in close contact with the fixing member 23.

  Further, in the longitudinal direction of the outer periphery of the operating rod 21, a support pipe 22 is overlapped and inserted concentrically. The support pipe 22 is a fixed member 23 having the same diameter, a moving member 25, an annular spring 24, etc. Are fitted on the same axis as that of the expanded pipe forming member, and are formed to be short enough to be able to secure the moving distance of the moving member and shorter than the actuating bar 21, and the actuating bar 21 as the same axis is used as a support pipe. A fixed member 23, an annular spring 24, and a moving member 25 are sequentially connected to one side of 22 so as to be slidable, and a pipe to be expanded 30 which is a molding object is concentrically formed on the outer periphery of the tube expansion molding port thus formed. It is accommodated with overlapping.

  One side end 23b of the fixing member 23 as described above is formed with a circumferentially cut coupling step jaw, and is coupled to one end of the support pipe 22 by special welding, and the inner end 23a at the other end is The sliding moving member 25 and the tapered inclined surface smoothly mesh with each other and coincide with each other, but only a part of the moving member 25 is tightly accommodated in the same taper (inclined surface), and the annular spring is fitted when meshing. A gap to be accommodated is generated, and the annular spring 24 is accommodated in the gap by the pressing force of the moving member, and a part of the inner end portion 23a at the other end is tapered so as to be pushed up and protrude, and the vertical surface and the inner inclined surface are simultaneously formed. It is formed into a shape having.

  Further, the moving member 25 meshed with the fixing member 23 has a contact end portion 25a tapered at one end so that the annular spring 24 can be pressed, and the other end accommodates a fixing screw 26 on the outer periphery. The cutting groove 25b to be engaged with the threaded portion 21b of the actuating rod 21 and screwed to the actuating rod are firmly fixed to the inner periphery. When the circumferential annular spring 24 is worn, the spring can be easily replaced by releasing the vertical fixing screw 26 having a wedge function and the horizontal screw portion fastening 21b.

  As described above, the hollow cap-shaped fixing member 23 and the moving member 25 use the annular spring 24 as a mold, slide linearly in the longitudinal direction of the operating rod 21, and are in close contact with the inclined slope surface. A pressurizing action is performed, and it is made of a special steel that has been subjected to a special heat treatment process that has high strength and excellent durability so as not to cause wear or deformation.

  As the central member of the present invention, an annular spring 24 (oil tempered wire or the like) that is fitted and joined to the outer periphery of the operating rod 21 and functions as a mold of the tube expansion port 20 (oil tempered wire, etc.) has high hardness, heat resistance, corrosion resistance, lubricity, restoration. It has material properties such as morphological stability such as force, and the titanium surface of the material is coated with titanium so that the spring performance can be improved. Even in this case, the wear is low, the stability of the uniform quality is provided, the elasticity of the spring is increased, and a material having excellent durability is used. Bending and winding a steel wire that has been processed into slanted lines at angles that engage each other in parallel so that the contact lengths of the contact portions 24a and 24b at both ends of the wire extend. Part of which forms a single circumferential annular spring 24 in mesh with the ring-shaped diagonally to each other are separated.

  The annular spring 24 having a single circumference as described above has a compression force and an initial tension by bending and winding, and has an elastic restoring force. The annular spring 24 is used as a molding die. In addition, the actuating rod 21 is pulled by the drive of the cylinder 10, and at the same time, the moving member 25 is slidingly moved to the fixed member 23 side simultaneously, and pressurizes the pipe to be expanded 30 fixed to the concentric axis. When an external force that pushes up the spring is applied by the elastic action of the annular spring 24 having a role, the external force contacts the predetermined angle of the oblique line because of the structure of the contact portions 24a and 24b that are obliquely engaged with each other. Acting on the part, the gap expands more than the normal circumferential diameter in the entire circumferential direction of the annular spring, and the extended circumferential length and spring The outer diameter of the pipe 30 to be expanded is locally expanded by a part of the thickness of the (mold), so that the circumferential protrusion (pi) of the claw 31 is formed, the shape is simple, and the manufacturing is possible. It is relatively easy.

  That is, in the state of the protruding claw 31 in which the outer diameter of the pipe to be expanded 30 is locally expanded, the contact portions 24a and 24b at both ends, which are a part of the annular spring 24, form a diagonal line, thereby extending the length of the line. An expansion effect can be exerted, and such a pipe expansion action is formed by projecting to the outer circumference of the pipe to be expanded 30 by applying a maximum uniform force to the pipe to be expanded in the direction of the center with the circumferential center of the spring as a centripetal point. The outer diameter of the protruding claw 31 can be expanded to a form that is closest to a perfect circle.

  Next, as still another embodiment of the present invention, as shown in FIG. 5, the shape of the contact portion to be separated of the annular spring is simplified, and the annular spring 24 keeps the normal position of the expanded tube. In addition, a protruding stopper is provided at the site of the contact end portion 25a, and an insertion groove for the protruding stopper is formed at the site of the inner end portion 23a, so that the portion that was insufficiently formed during the primary tube expansion is expanded pipe It is also possible to rotate 30 appropriately and further expand the tube once more to form a perfect circle, and the contact portion can be formed in various shapes.

  Further, when the moving member 25 is separated from the fixed member 23 after performing the pipe expanding action of the annular spring 24, a force to always return acts, so that the annular spring 24 expanded by the pressurization has an elastic restoring force. Thus, the original circumferential length (pie) is restored, and the pipe to be expanded 30 completed by the pipe expansion molding can be easily removed.

  The present invention formed in this way can adjust the size of the spring and the angle of the oblique line according to the diameter of the pipe, so that it can be applied to pipes of various sizes and long pipes. Tube expansion is possible in a plurality of portions, and a plurality of protrusions can be formed on one pipe.

  Further, as shown in the present invention, when the spring is used repeatedly as a mold, a phenomenon that the spring becomes loose occurs and the performance is deteriorated. Therefore, hydraulic or pneumatic fingers are sometimes generated. By removing the spring that has been loosened by using, etc., it will return to its original pie (circular diameter) size, making it easier to remove the pipe to be expanded after it has been processed and to install a new pipe. Is desirable.

  The present invention is not limited to the above-described embodiments. Various modifications can be made without departing from the technical scope of the present invention.

  According to the present invention, since the shape of the spring used as the mold is simple, the design and manufacture are relatively simple, so the manufacturing cost is lower than that of the conventional mold, the device is simple, and the spring is replaced. Therefore, the pipe expansion work is simplified, and even an unskilled worker can perform production quickly. Furthermore, it is an easy and easy to operate and economical pipe expansion device, and in particular, a thin pipe having a small diameter can be partially expanded in appearance.

The perspective view which showed the whole structure of this invention. The connection state figure of the power unit by this invention and a pipe expansion molding apparatus. FIG. 3A shows a state where the moving member of the tube expansion molding apparatus is separated from the fixed member, and FIG. 3B shows a state where the moving member of the tube expansion molding apparatus moves to perform the tube expansion work. FIG. The enlarged view of the principal part by one Example of this invention. The figure which showed the other Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Cylinder 11 Board | substrate 12 Screw 13 Fixing base 14 Circular support frame 15 Movable plate 16 Piston 16a Screw part 18 Support base 20 Tube expansion port 21 Actuating rod 21a, 21b Screw part 22 Support pipe 23 Fixing member 23a Inner end part 23b End part 24 Annular springs 24a and 24b Contact portion 25 Moving member 25a Contact end portion 25b Cutting groove 26 Screw 30 Expanded pipe 31 Projecting claw

Claims (2)

  In the pipe expanding apparatus, the base plate (11) has a base plate (11) that expands the pipe by moving the operating rod loosely by advancing and retracting a piston using a cylinder and partially pressurizing and pushing the inner peripheral surface of the pipe to a pipe expanding port connected thereto. The cylinder (10), which is fastened to the fixing base (13) with a screw (12), and the piston (16) and the operating rod (21) are connected and fixed to each other with screws (17a, 17b) on the inside. 10), a circular support frame (14) having a movable plate (15) for moving the operation rod (21) forward and backward by the drive of 10), and a long circular rod-like operation rod having a circular cross section on one side of the circular support frame (14). 21) is a hollow support pipe (22) concentrically housed and mounted, and one end (23b) having a stepped jaw with the actuating rod (21) as a central axis is at one end of the support pipe By special welding A part of the vertical inner end (23a) at the other end is tapered so that only a part of the moving member (25) is tightly accommodated on the inclined surface and the annular spring (24) is pushed up by the applied pressure. The fixing members (23) and the operating rods (21) are fitted into the outer peripheries of the contact members (24a, 24b) that are engaged with each other so as to extend the contact length of both end portions. One-side contact that matches with the link-shaped single-circular annular spring (24) and fixing member (23) formed by bending and winding an elastic steel wire processed into oblique lines, and forming a part of the body separately The end portion (25a) has a tapered cross section, and the other end portion has a cutting groove (25b) that accommodates the screw (26), and a screw portion (21b) formed so as to mesh with the operating rod (21) on the inner periphery. The pipe expansion port (20) is formed by the member (25). Expanding apparatus of the pipe, characterized and.   The annular spring (24) has material properties such as high hardness, heat resistance, corrosion resistance, lubricity, and morphological stability such as restoring force. The surface of the material is made of titanium so that the spring performance can be improved. 2. The pipe expansion apparatus according to claim 1, wherein the pipe expansion apparatus is formed of a coated high-elasticity titanium-coated steel wire.

Images